I'm not sure if this is an issue with ChestEX or Automate.When these two mods are used together, Automate seems to be able to detect only a limited number of cells in the box, as if only the size of the original box, and can not detect the part I added through Chestex.

Hi! Automate should see all items in the chest, but when pushing new items into the chest it depends on the max size specified in the chest data. Mods can override that, so that would be a question for the ChestEx author.